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The CY8C3866AXI-040 is a microcontroller from Cypress Semiconductor (now part of Infineon Technologies). Below are its key specifications, descriptions, and features:

Manufacturer:

Cypress Semiconductor (Infineon Technologies)

Specifications:

• Core: 32-bit ARM Cortex-M3
• Max CPU Frequency: 40 MHz
• Flash Memory: 64 KB
• SRAM: 8 KB
• Operating Voltage: 1.71V to 5.5V
• Package: 100-TQFP (14x14mm)
• GPIO Pins: Up to 72
• Timers:
• Four 16-bit timers
• One 32-bit timer
• ADC:
• 12-bit SAR ADC
• Up to 16 channels
• Communication Interfaces:
• UART (up to 4)
• I²C (up to 2)
• SPI (up to 2)
• USB 2.0 Full-Speed (optional)
• Analog Peripherals:
• Programmable Analog Blocks (PSoC CapSense® support)
• Comparators
• DAC (8-bit)
• Operating Temperature Range: -40°C to +85°C

Descriptions:

• Part of the PSoC 3 family, combining programmable analog and digital blocks with an ARM Cortex-M3 core.
• Supports CapSense® touch-sensing technology for capacitive touch applications.
• Flexible programmable logic for custom peripherals.
• Low-power modes for battery-operated applications.

Features:

• Mixed-Signal Integration: Combines MCU, analog, and digital peripherals.
• Low Power: Multiple power-saving modes (Sleep, Hibernate).
• High-Speed Operation: Up to 40 MHz with single-cycle multiply.
• Robust Development Support: Compatible with PSoC Creator IDE.
• Wide Voltage Range: Operates from 1.71V to 5.5V, suitable for various applications.

This microcontroller is commonly used in embedded systems, industrial control, consumer electronics, and touch-sensing applications.

Would you like additional details on any specific aspect?